define-properties.js

const { isObject, isFunction } = require('lodash')
const { cond, identity, T } = require('ramda')

const makeDescriptor = cond([
  [isFunction, value => ({ get: value })],
  [isObject, identity],
  [T, value => ({ get: () => value })]
])

/**
 * @method getDescriptors
 *
 * @param  {Object}   values
 * @return {Object}
 */
const getDescriptors = values => Object.keys(values)
  .reduce((acc, key) => {
    return Object.assign({ [key]: makeDescriptor(values[key]) }, acc)
  }, {})

/**
 * @method defineProperties
 *
 * @param  {Object}         obj
 * @param  {Object}         values
 * @return {Object}
 */
const defineProperties = (obj, values) => {
  const descriptors = getDescriptors(values)
  return Object.defineProperties(obj, descriptors)
}

module.exports = defineProperties